Exercise mat



FIG. 1 is a top view of an exercise mat, showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is a side view thereof. 

CLAIM The ornamental design for an exercise mat, as shown and described. 